Process for manufacturing an antiperspirant stick

A - Human Necessities – 61 – K

Patent

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Details

A61K 8/26 (2006.01) A61K 8/28 (2006.01) A61Q 15/00 (2006.01)

Patent

CA 2164504

The present invention provides a process for making a solid antiperspirant stick comprising a particulate aluminum antiperspirant salt suspended in an anhydrous carrier vehicle, wherein said carrier vehicle comprises a high melting component which melts at 70 °C or higher. This process includes heating the carrier vehicle in a closed mixing vessel to a temperature in excess of 70 °C, preferably in excess of 75 °C, to melt the high melting component, adding the antiperspirant salt to the carrier vehicle, and cooling the carrier vehicle to form a solid antiperspirant stick. The improvement of the present invention comprises cooling the carrier vehicle below 70 °C, preferably to about 65 °C or less, but above the solidification point prior to adding the antiperspirant salt and maintaining the carrier vehicle below 70 °C, preferably at about 65 °C or less, during and after the antiperspirant salt addition, thereby substantially preventing agglomeration of the antiperspirant salt into large particles, especially particles in excess of 60 microns.

La présente invention concerne un procédé de production d'un bâtonnet antitranspiration solide, comprenant un sel antitranspiration d'aluminium particulaire, en suspension dans un excipient anhydre. Cet excipient comprend un composant à point de fusion élevé qui fond à 70 DEG C ou plus. Ce procédé consiste à chauffer l'excipient dans une cuve de mélange fermée, à une température dépassant 70 DEG C, de préférence dépassant 75 DEG C, afin de faire fondre le composant à point de fusion élevé, à ajouter le sel antitranspiration à l'excipient, et à refroidir l'excipient afin d'obtenir un bâtonnet antitranspiration solide. L'amélioration de la présente invention consiste à refroidir l'excipient en dessous de 70 DEG C, de préférence à environ 65 DEG C ou moins, mais au-dessus du point de solidification avant d'ajouter le sel antitranspiration, et de maintenir l'excipient au-dessous de 70 DEG C, de préférence à environ 65 DEG C ou moins, pendant et après l'ajout du sel antitranspiration, ce qui empêche ainsi le sel antitranspiration de s'agglomérer en grosses particules, notamment en particules de plus de 60 microns.

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